Maybe possibly kinda. As you would know if you read the FAQs, there are two pools in a general bid: one for veterans and CTI combined, and then a second pool for normal off-the-street civilians. It used to be the two pools had to have a similar number of referees, and it used to be there were far more Pool 2 applicants than Pool 1. So if you went to a CTI school you were competing among fewer people to get referred.
As of this past year they changed the law and the pools no longer have to be equal. It remains to be seen if that'll be a benefit for CTI people (they might get favored now) or if it won't be (they'll now essentially be comparing scores among all groups instead of a smaller pool). It depends on how the FAA plays it.
Obviously the point of the CTI program was to educate people before they got to OKC and weed out the ones who couldn't hack it, so theoretically CTI grads should pass the Academy at higher rates than non-CTI. I don't think that's been the case, historically.